golf trophy awarded to the winner of a competition between amateur men's teams from the United States and the British Isles, held biennially since 1922 on sites alternating between the United States and Britain. The cup is named for George H. Walker, a president of the United States Golf Association (USGA) in the 1920s and a primary organizer of the event. Contests consist of four 18-hole foursome (partners taking alternate shots) matches and eight 18-hole singles matches on each of two days, with one point awarded to the winning side in each match. Teams of eight players, two alternates, and a captain are selected by the USGA and the Royal and Ancient Golf Club of St. Andrews, Fife, Scot.